Micropropagation of rubber trees (Hevea brasiliensis Muell. Arg.)

Abstract

Tissue cultures were established from newly expanded leaves and axillary buds of rubber trees (Hevea brasiliensis Muell. Arg.). Calli formed from these explants, but no regeneration occurred. Shoots were obtained from axillary buds cultured on Murashige and Skoog's (MS) medium (Physiol. Plant. 15: 473-497, 1962) supplemented with 1.0 mg/l kinetin, 1.0 mg/l 2,4-dichlorophenoxyacetic acid (2,4-D), 20 g/l sucrose and 4 g/l Difco agar. Formation of a root similar to a tap root was induced on MS medium supplemented with 5.0 mg/l naphthaleneacetic acid (NAA), 3.0 mg/l indolylbutyric acid (IBA), 50 g/l sucrose and 4 g/l Difco agar. Several types of explants were used in attempts to recover complete rubber tree plants with well-developed tap roots. Leaf explants and axillary buds formed calli on MS basic medium with different combinations of kinetin, benzylaminopurine (BAP), 2,4-D, IBA, NAA and indolylacetic acid (IAA). The antibiotic tetracycline was also used to control possible bacterial infections. However, no antibiotic effect was noted. Calli formation was abundant, but no regeneration was observed when the calli from different media was transferred to MS medium without growth hormones. On this basic medium, callus cultures became necrotic and died. Shoots developed from axillary buds, rooted vigorously when cultured on MS medium with NAA, IAA, and IBA. Based on these results, further studies with commercially important clones should lead to a feasible micropropagation technique.<br>Culturas de tecidos in vitro foram estabelecidas de folhas recém-expandidas e de gemas axilares de seringueira (Hevea brasiliensis Muell. Arg.). Houve formação de calos nestes explantes mas a regeneração destes calos em embrióides não ocorreu. Brotos foram obtidos de gemas axilares cultivadas no meio de cultura básico de MS (Murashige and Skoog (Physiol. Plant. 15: 473-497, 1962)), suplementado com 1,0 mg/l de cinetina, 1,0 mg/l de ácido 2,4-diclorofenoxiacético (2,4-D), 20 g/l de sacarose e 4 g/l de ágar Difco. Para o desenvolvimento do sistema radicular com raiz pivotante o meio de cultura usado foi o MS, suplementado com 5,0 mg/l de ácido naftalenoacético (NAA); 3,0 mg/l de ácido indolilbutírico (IBA); 50 g/l sacarose e 4,0 g/l ágar Difco

UPAYA PERBAIKAN GENETIK DAN PENYEDIAAN BIBIT TANAMAN KARET (Hevea brasiliensis Muell. Arg.) MELALUI PENDEKATAN BIOTEKNOLOGI

“…Pada tanaman karet metode ini telah digunakan sejak awal tahun 1970-an, namun sampai saat ini perkembangan metode ini belum optimal dan memiliki nilai keberhasilan yang rendah dalam perbanyakan tanaman karet. Mendanha et al (1998) telah melaporkan mikropropagasi Hevea brasiliensis menggunakan sumber eksplan daun dan tunas aksilar melalui metode organogenesis. Hasil penelitian tersebut menunjukkan bahwa eksplan daun hanya mampu menghasilkan kalus dan belum berhasil meregenerasikan tunas ataupun organ sedangkan eksplan tunas aksilar dapat membentuk tunas.…”

Germination and in vitro development of mature zygotic embryos and protein profile of seedlings of wild and cultivated Hevea brasiliensis

“…These seeds have recalcitrant characteristics, and easily lose viability and germinative power (Bonome et al 2011, Theodoro & Batista 2014, Souza et al 2018). In addition to the diffi culties related to the recalcitrancy of seeds, this is a longterm process since clones require one to two years before plants can be transplanted into the fi eld (Mendanha et al 1998, Alvarenga & Carmo 2014, Martin et al 2018. Three selection stages covering approximately 30 years are generally required until the fi nal choice of clones is ready for large-scale planting (Gouvêa et al 2013), and this long period is one of the main limitations in Hevea breeding programs (Rahman et al 2017).…”